What is the meaning of 異端?

heresy (dissension from religious dogma)

heretic, illegitimate, heterodox

heresy (dissension from religious dogma), illegitimacy, heterodoxy

hanja form of 이단 (heresy (dissension from religious dogma))

chữ Hán form of dị đoan (to be superstitious; to be heretical).

Source: wiktionary.org